66066128 has 20 divisors (see below), whose sum is σ = 129139428. Its totient is φ = 32739840.

The previous prime is 66066109. The next prime is 66066137. The reversal of 66066128 is 82166066.

It can be written as a sum of positive squares in 2 ways, for example, as 30162064 + 35904064 = 5492^2 + 5992^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16463 + ... + 20078.

Almost surely, 2^66066128 is an apocalyptic number.

It is an amenable number.

66066128 is a deficient number, since it is larger than the sum of its proper divisors (63073300).

66066128 is a wasteful number, since it uses less digits than its factorization.

66066128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36662 (or 36656 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 66066128 is about 8128.1072827565. The cubic root of 66066128 is about 404.2589262629.

The spelling of 66066128 in words is "sixty-six million, sixty-six thousand, one hundred twenty-eight".